Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3510fd1d7d723ee…

MALICIOUS

PDF

63.8 KB Created: 2021-09-12 23:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ca3e6f00114d78e328e676483956d84 SHA-1: 07e131aafac3cf0de48c78f94643b4654971ef57 SHA-256: f3510fd1d7d723ee9668c20f5b4ce5ee9aa270bbd776e971f6571cd3b20e457e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with several embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, possibly for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7924

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ppuhperspektywa.pl/files/edytor/file/gebizotuzitukuxukelidade.pdf In PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/28612700285.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/99071421137.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/rujipejirogut.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee870eb3c---wasivumiwatel.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/58135022396.pdfIn PDF document text
    • http://ossokahve.com/upload/file/rumudetitajasuvediripemop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e16942ef7---32190173960.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/dubikedijexebaruva.pdfIn PDF document text
    • https://parc-hotel.info/file/wewevikubisasudodoso.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/78007855994.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353f4e2d0d7---64840570631.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/zefilodetebusep.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/30981995926.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/dinurezemepez.pdfIn PDF document text
    • http://donghotam.com/luutru/files/50467323402.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/15508451076.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/karadejokakeperisigaki.pdfIn PDF document text
    • https://sentralperdana.com/file/26055641416.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/kapimeredakexukojag.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/37360479059.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/sabaxumikowarax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=xiaomi+system+app+updater+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC171 10716 bytes
SHA-256: bf8186c6c320dd7145b00bd11cd0280f7fb5088a3b3cf9d632efad31a9caaab4
font_01_sfnt_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 17452 bytes
SHA-256: 69014430ed575bb4699f83de153561138b431f6fe692dd2391e73535afa8bf12

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